Casting mold



`Iuly 25, 1933. F Ml PQE CASTING MOLD Filed April 29, 1932 Patented `luly 25, 1933y narra rezan@ FRED IVI. POE, OF SUIEFER'N, .NEW YORKfASSIGNOR T0 THE AMERICAN BRAKE SHOE AN D FOUNDRY-COIVIPANY, 0F WILMINGTON, DELAWARE A CORPORATION OF DELA- i WARE i cnsriive Morin Application filedrApril 29, 19432. Serial No. 608,171.

upon the casting, and thereby eliminate the necessity for normalizing or annealing certain types and classes of castings,fby inaking the walls of the mold cavity. sufficiently refractory for the purpose and in such a way that they will standtheheatrchanges, .l

the `ordinary molding practices and' other factors which tend to seriously damage and cavity, made in kWhole or in part of refractory wall surfaces, may be used Vfor repetition casting operations. 1

Heretoforeithas been proposed to apply a coating of refractory material yto the Walls of the mold cavity; to make up the walls of a plurality of blocks of refractory material; or to inset blocks of refractory material'in the metal walls of the mold cavity. The refractory material in all such cases` is liable toV damage and vdestruction because of heat changes, molding practices and other vents or materially reduces the chilling effect ofthe metal mold and at the saine time it is protected by the embeddedgrate against v the ill effects of heat changes,'molding practices and other factors commonrinV casting operations, so that the life of the refractory TNill be'prolonged to permit the mold to jbe continued in use for repetitionniolding operations. 4 Y

And a further object of the inventionisjto provide fa mold cavity `wall consisting of refractory material divided into many small independent sections, each section beingl surrounded by a thinmetal strip which-supports, reenfo'rces and protects the refractory section against Adamage Vin molding operations. i

In' the accompanying drawing illustrating selected embodiments of the invention Fig. l is a longitudinal sectional vijew of a mold.vv Figs; 2 `and 8 are transverse sectionalviews on the'lines 2 2 and 8 3 respectively of Fig.v l: l

Fig. 4 is av detail sectional view on the line n I 4 4 of Fig. l. destroy refractory surfaces so that the mold Figs. 5I and *6 are detail views yshowing other embodiments of tlie'inveiition. i

Referring to the drawing, the mold coniprises a drag 6 and a cope 7'haviiig a mold cavity 8,'ajpouring gate 9 "and a riser l0. The "drag is provided with ears ll and pins 1l thereon to engage openings l2 in the ears on the copeto register the cope in place on `the drag. 'I have shown a mold of simple construction to illustrate the invention Vbut l desire it to be understood that the invention mayrbe embodied in molds of any construe tion and for any purpose for which it is or may be adapted. Allr or a part of the walls of the moldcavityfare formed in part of metal and in aart of refractory material, the metal andre ractory material being divided and spaced and `arranged so that there is a predetermined distributionv of the metal in f the refractory, the area and depth of the re-Y fractory being determined by the character of the casting operationto provide the proper protection for the casting' and prevent the casting from. becoming chilled by the metal of the mold and so .that the mold can be used for repetition "casting operations; and the metal being distributed and arranged in a predetermined manner to form a substantial support for the refractory and thereby provide stable surfaces for the wallsof the mold cavity to enable repetition casting. These surfaces may be allrefractory or they may be mainly refractory with stripsor streaks of metal distributed therein. These stripsor Y AV.2o

the grate. i" The refractory material Vmay be "paclred in therecesses of-tliefinold cavityj Vstreaks ofmmetal are so narrow and ofsuch small area that tney will not produce a ina-v terial chilling effectupon the casting or otherwise destroy the effect of the refractory.

The Walls. of kthemetal drag and cope; are

cored; boredor otherwise recessed to provide a plurality 'of strips 18 WhicliieXtend to or almost to the Asurface of thel mold` cavity.l

These strips are narrow/,they niaybeinade -of any height and thickness and shape, and y they maybe arranged in anymannersuitable for the purpose. In Figs. 1 to l I have 1 shown the strips arranged in a symmetrical criss-cross grate providingrectangular recesses but I may provide a grate 14 vvith hexagonal recesses, Fig. 5, or a grate l'vvith circular recesses, Fig; 6,.or'I maymalrethe grate i in any other generalhoneycomb del sign; The. recesses of the grate arefilledV With/*refractory material 16 of any suitable kind and this refractory inaterialfis prefer-Vv ably `finished off flush with the oiuerjedge of Walls any suitable mannerV and byany suitable nie'ans. The bottom `ivall of the mold pouring gate including the end Wall Aof lthe mold cavity may be recessed to provide Y studs' 17 in asteplilrearrangement With the intervening recesses filledV with refractory material 18,'and vthe bottom Wall of the riser,

' Fig. 2, maybe similarly. provided with studs 19 and refractory material' 20.* Insteadcfl coringvor boring the Walls ,of theniold. cavity y to provide .tliegrate forthe 'refractory `the grate may beprovided in suitable `1naii honeycomb design suitable to receive the `refractory material to constitute a support and protection therefor VWithout to any niaterial extent chilling the casting.V While the f aggregatek area of the grateexposed at the surface of the Wall may be sulicient if coni-V bined in a solidsection tochill a casting at ythe contact therewith, the" distribution of this nietalintheform of a grate composed of narrow strips avoids any material'chillw ing effect therefrom and at the sainev time-the grate provides a substantial support forthe refractory to protectathe refractory against damage in the casting operations andenables f the mold to beused for repetition casting for doesiiot have anyV material chilling effect upon the casting,*If'prefer4 to ini'shf off the refractory flushivith the grate vbut there may be conditions Vfor ivhichit is: desirable to n, provide a continuous refractorysurfacecfor n K the ivall of the mold cavity and in such case Vthe refractory may bek finished off over the grate. i v v g Preliminary vtothe casting operation I prefer to coat the surface of the mold cavity "Wallsjivitli lamp blaclr or any other protective coating which is or may be suitable for the purpose.l I do not'iestrictthe invention tofrefractory" material of any particular kind but I may use any material of loiv heat `conductivity suitable for the purpose;y

andit is my intention to vary the honeycomb design of the grate as may bef-best for particular molds but in all cases the refractory materialivill be divided into separate Vand independent sections and each section Will be. reenforced and protected bythe grate. Gastingoperations are more or less rough'and there is always the liability of some heavy article falling on the cavity Wall in the cope ordragland daii'iaging the refractory"materialiV and this refractory forms a continuous surface the damage may be spreadover such an area that complete .renelivalfofvfthe'refractory is necessarT but ivithiny inventionsuchfdainage will usually be confined to they immediate section or sections receiving tliedamaging blovv becaus'eeach sectionis independently support ed and protected by the grate and'damage to one section Afof refractory material fis not likely to spread to otherfsections. ThereforeV the maintenance cost of a repetition mold having refractory, cavity Walls is niaterially` reducedQby my' invention and interruption of the use `of the'` mold for re-v pairs is correspondingly reducedh, i Y

Y .I do not the invention to the p artic ular forni,y construction orv arrangement shovfiiv and described herein but AI reserve the right `to embodythe invention in any mold and in any form, construction and ariraiigeiiieiitY` suitable for theA purpose and I claimff y y y i l`.fA"Wall"vVith vWhich the molten metal vvithinfthe scope of thefolloivingclaims. y 1

contacts in aimold aiidcornprising refrac-k tory "material and a'inetalhgrate embedded in the refractory finaterial. to support 4:and

` protect the refractory-material.

A f all: with which theI molten metal contacts jin a, mold ,and comprising refractoryv material and .al metal grate of lhoneycomb design embedded in the'K refractory ina- 'Inaterial Y y n y l toryrnaterial: and anietal grate having-fina long time. For thereason that the grate Y 4dependent recesses therein and embedded in the refractory material, the said refractory terial tosupport and protect the refractory ice y llO 6. A Wall with which the molten metal contacts in a mold and I comprising refractory material and a metal grate embedded therein and having circular recesses which divide the refractory material into separate circular sections.

FRED M. POE. 

